Thanks an zillion times Dr Geep. I will have another dial to play with ! And a mini tut for me : I'm honoured ! (yes, I know : being honoured for my ignorance... But hey, this is a DR GEEP mini tut !). (PS : your tube looks more like a scanner : MRI machinery leaves much less room for the patient : Dr Geep couldn't go inside together with Miss Posey ! Back in my hospital days, we used to call it "the pizza oven" ! )